Faceless Wanderer

Memory Loss. A creature that sees or interacts with a faceless wanderer must make a DC 11 Wisdom saving throw 1 minute after the faceless wanderer leaves. On a failure, the details of the faceless wanderer and the events surrounding its appearance rapidly fade away from the creature's mind, including the presence of the faceless wanderer.

Regeneration. The faceless wanderer regains 5 hp at the start of its turn. If a creature hasn't failed the saving throw of the faceless wanderer's Memory Drain within the last 1 minute, this trait doesn't function until a creature fails it. If a faceless wanderer is reduced to 0 hp while it is still capable of regenerating, its body dissipates into vapor and reforms 1d10 days later somewhere in the Void. Otherwise, it is permanently destroyed.

Multiattack. The faceless wanderer makes two attacks, but it can use its Memory Drain only once.

Claws. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 6 (1d6 + 3) slashing damage plus 7 (2d6) psychic damage.

Memory Drain. The faceless wanderer drains memories from an adult creature within 30 feet of it. The target must make a DC 13 Intelligence saving throw. On a failure, the target takes 14 (4d6) psychic damage and its Intelligence score is reduced by 1d4. The target dies if this reduces its Intelligence to 0. A humanoid slain in this way rises 1d4 hours later as a new faceless wanderer. Otherwise, the reduction lasts until the target finishes a short or long rest. On a success, the target takes half the damage and its Intelligence score isn't reduced.